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conversion varnish turning soft

9/26/18       
Derek Member

I have been spraying CV for many years. Recently a couple of pieces have had issues. Pieces are coming back where the high touch areas, i.e. chair arms, the finish is very soft and weak. You can scrape it off easily with your fingernail. The rep says it's just the way it is with the oils from your skin. I say that is unacceptable. This is with both ML Campbell Krystal and Envirovar. Has anyone else had this issue?

9/26/18       #2: conversion varnish turning soft ...
mastercabman Member

Not with Krystal

9/27/18       #3: conversion varnish turning soft ...
Shane

Over new substrate or refinished?
Could be a number of issues.. start with the details. could be as simple as not measuring catalyst correctly... Surface contamination.... recoat windows.... Not blending the product correctly before it's introduced to your equipment.... Using product past it's pot life... especially in hot humid weather it will decrease potlife etc etc..

9/27/18       #4: conversion varnish turning soft ...
Derek Member

Thank you Shane. Yes, all of the basics were performed/followed correctly, on new wood. It seems to be only specifically the high touch areas, as the rest of the piece is holding up well. I mostly don't think CV should break down from exposure to skin, but that appears to be the case.

9/27/18       #5: conversion varnish turning soft ...
Brian Member

If CV is applied heavily, the top of the film may dry and cure, but what's underneath may not, and remain somewhat soft because of trapped solvents in the film.

9/27/18       #6: conversion varnish turning soft ...
Derek Member

hmmm....heavy top coat, that's an interesting theory. Of all the places on a chair, the top of the arms could get a heavy coat. Do you think it could stay soft like years later? Thanks Brian.

9/27/18       #7: conversion varnish turning soft ...
Bob Niemeyer  Member

Website: niemeyerrestoration.com

I have seen CV breakdown very quickly on areas of high wear and also areas that get contact from sweat and skin oils. Some people are just dirty and dont clean their furniture also. If they clean and maintain it will last much longer.

Our family has been finishing for four generations and we have seen some crazy stuff. I have seen finishes fail in about a year when people dont clean or are just very dirty. What you describe does not surprise me.

9/28/18       #8: conversion varnish turning soft ...
rich c.

Not a conversion varnish finish, but I did a desk set with a pen for a good customer. The pen finish was ruined in a few months. She used a lot of hand lotion for a dry skin condition. Maybe a contributor to this situation?

10/2/18       #9: conversion varnish turning soft ...
Brian Member

I don't know about years, but eventually the solvent that is trapped will evaporate and cross linking of the resins may begin, but cross linking is somewhat dependent upon oxidation (air movement) and may be very slow, if it occurs at all.


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